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Jim Boylan, Milwaukee Bucks
Jim Boylan coached the Milwaukee Bucks to a record of 22-28 as their interim head coach. After going 4-12 to close out the regular season and being swept by the Miami Heat in the first round of the NBA playoffs, however, Boylan was let go.
No replacement has been found just yet.
P.J. Carlesimo, Brooklyn Nets
The Brooklyn Nets promoted P.J. Carlesimo to the role of interim head coach after firing Avery Johnson 28 games into the 2012-13 regular season. In that time, Carlesimo coached the Nets to a record of 35-19.
After losing to a shorthanded Chicago Bulls in the first round of the 2013 NBA playoffs, however, Carlesimo was let go. No one has been hired to replace him.
Doug Collins, Philadelphia 76ers
Doug Collins resigned after three seasons as the head coach of the Philadelphia 76ers. In that time, Collins led the Sixers to two postseason appearances and a berth in the Eastern Conference semifinals.
No replacement has been named.
Mike Dunlap, Charlotte Bobcats
Mike Dunlap spent just one season with the Charlotte Bobcats, creating a far more competitive team than the one we saw in 2011-12. During the 2012-13 season, Charlotte improved their win percentage by .150 points.
Charlotte decided to go in a new direction and has yet to name their coach for the next season.
Lawrence Frank, Detroit Pistons
Lawrence Frank spent two seasons as the head coach of the Detroit Pistons before he was let go at season's end. In that time, the Pistons saw a decrease in winning percentage.
Detroit has yet to decide which available name will serve as their next head coach, but Phil Jackson is advising their search.
Byron Scott, Cleveland Cavaliers
Byron Scott spent three years at the helm of the Cleveland Cavaliers, never once topping 25 wins in a season. After the Cavs went 24-58 in 2012-13, Scott was let go in favor of a fresh start for this young team.
Cleveland has named Mike Brown as Scott's replacement (via ESPN).